Ground-Fault Circuit Interrupters (GFCI): What They Are and Why You Need Them

Electrical shocks are fast. A current passing through the human body for even a fraction of a second can cause cardiac arrest. That’s the problem a GFCI is designed to solve — and it does so remarkably quickly.

What Is a GFCI, Exactly?

A Ground-Fault Circuit Interrupter monitors the current flowing through a circuit. In normal operation, the current going out to a device and returning to the source should be equal. If those amounts differ by as little as 5 milliamperes, the GFCI cuts power in approximately 1/40th of a second.

Where GFCIs Are Required

OSHA requires GFCI protection for all 15A and 20A, 125V receptacles on construction sites. This is a regulatory requirement with meaningful penalties. In 2019, a company was cited $1.59 million in OSHA penalties partly due to the absence of proper GFCI protection following a fatal accident.

Inline GFCI Extension Cords

Extension cords with built-in inline GFCIs bring protection directly to where the work is happening — no need to rely on permanent GFCI outlets that may not be present on a new construction site. Test the GFCI at the start of every workday using the test and reset buttons. A tripping GFCI means there’s a ground fault — investigate before resetting and continuing work.

Bottom line: If you’re working anywhere with power tools, outdoor outlets, or wet or damp conditions, GFCI protection isn’t a luxury — it’s the law and a fundamental safety measure. JHL’s GFCI cords meet UL, OSHA, NEMA, AWG, CSA, and RoHS specifications.